looks like some kind of serialization error, I'm guessing the item named in this message changed sometime between when I last played this save (April 30, so either 1.0.2 or 1.0.3) and the beta.
Seems pretty consistent, I tried three times and got the exact same message during the map transition to the facility each time. I've attached a save made right before the crash.
LowLevelFatalError [File:C:\UE5_SOURCE\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoading2.cpp] [Line: 7283]
ObjectSerializationError: /Game/ITR2/BPs/LevelObjects/Store/BPA_StoreShelf_LightStand (0x1C587E553BD9EF38) /Game/ITR2/BPs/LevelObjects/Store/BPA_StoreShelf_LightStand (0x1C587E553BD9EF38) - RadiusStoreItemPointComponent /Game/ITR2/BPs/LevelObjects/Store/BPA_StoreShelf_LightStand.BPA_StoreShelf_LightStand_C:P_HeadFlare1_GEN_VARIABLE: Serial size mismatch: Expected read size 80, Actual read size 93
IntoTheRadius2_Win64_Shipping!FAsyncPackage2::EventDrivenSerializeExport()
IntoTheRadius2_Win64_Shipping!FAsyncPackage2::Event_ProcessExportBundle()
IntoTheRadius2_Win64_Shipping!FEventLoadNode2::Execute()
IntoTheRadius2_Win64_Shipping!FAsyncLoadEventQueue2::PopAndExecute()
IntoTheRadius2_Win64_Shipping!FAsyncLoadingThread2::Run()
IntoTheRadius2_Win64_Shipping!FRunnableThreadWin::Run()```